Wiring Diagrams - White Rodgers 1F89-11 Installation And Operation Instructions Manual

NOTE
The following wiring diagrams show typical terminal
identification and wiring. For proper installation, refer to
O/B
Changeover
Relay*
* Changeover Relay is energized in COOL when O/B switch is in the "O" position
NOTE
If safety circuits are in
only one of the systems,
remove the transformer
of the system with NO
safety circuits.
CUT AND
TAPE OFF!
HOT
120 VAC 24 VAC
NEUTRAL
* Changeover Relay is energized in COOL when O/B switch is in the "O" position
Changeover Relay is energized in HEAT when O/B switch is in the "B" position
Figure 4. Typical wiring diagram for two transformer systems with NO safety circuits
FAN ON
FAN
AUTO
Heat
or Cool
O/B Y G
Changeover Fan
Relay* Relay
Compressor
Contactor
* Changeover Relay is energized in COOL when O/B switch is in the "O" position
Changeover Relay is energized in HEAT when O/B switch is in the "B" position
Figure 5. Typical wiring diagram for two transformer systems with safety circuits in BOTH systems
FAN ON
FAN FAN
AUTO AUTO
Heat Emer
or Cool
Y G
Fan
Relay
Aux/Emer
Compressor
Relay
Contactor
(Stage 2)
Changeover Relay is energized in HEAT when O/B switch is in the "B" position
Figure 3. Typical wiring diagram for single transformer systems
FAN ON
FAN
AUTO AUTO
Heat
or Cool
O/B Y G
Changeover Fan
Relay* Relay
Compressor
Contactor
Thermostat
Control
FAN
Circuit
EMERGENCY
AUTO
Emer
W2 E C
Emergency
Relay
Aux/Emer
Relay
(Stage 2)
TWO COMMONS MUST
BE JUMPERED TOGETHER!
the original manufacturer's instructions.
Relay contacts shown are thermostatically operated.
MALF
Thermostat
Control
Circuit
EMERGENCY
W2 E C
SYSTEM
Emergency
MONITOR
Relay
SWITCH
Thermostat
Control
FAN
Circuit
EMERGENCY
Emer
W2 E C
Emergency
Relay
Aux/Emer
Relay
(Stage 2)
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Polarity must be observed. If the HOT side of
the second transformer is jumpered to the
MALF
COMMON side of the first transformer a short
will be made. Damage to equipment will occur
when power is restored.
L
R
Limit or
Safety
Switches
SYSTEM
MONITOR
SWITCH
24 VAC
ACCESSORY
RELAY N.O.
CONTACT
COMMON
Limit or
Safety
Switches
COMMON
3
THERMOSTAT
L R
SYSTEM
Hot
24 VAC 120 VAC
Neutral
TRANSFORMER
MALF
THERMOSTAT
L R
SYSTEM
SYSTEM
Limit or
MONITOR
Safety
SWITCH
Switches
24 VAC
TRANSFORMER
NOTE
THERMOSTAT
SYSTEM
Limit or
Safety
Switches
24 VAC
120 VAC
Auxiliary
Heating
Transformer
The accessory relay scheme
is required
circuits exist in both systems.
Limit or
Safety
Switches
24 VAC 120 VAC
NEUTRAL
Heat Pump Transformer
Hot
120 VAC
Neutral
HOT
NEUTRAL
NOTE
when safety
HOT